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Lesson 1: Introduction to JavaScript
Understanding JavaScript
In this lesson, we'll introduce JavaScript and explore its key features, applications, and basic syntax. JavaScript is a high-level, interpreted programming language known for its ability to add interactivity and behavior to webpages.
Key Features of JavaScript
1. Client-Side Scripting:
JavaScript is primarily used for client-side scripting in web development, allowing for dynamic content and interactive user experiences.
2. Event-Driven:
JavaScript is event-driven, meaning it responds to user actions such as clicks, mouse movements, and keyboard inputs.
3. Versatility:
JavaScript can be used for various purposes, including DOM manipulation, form validation, asynchronous programming (AJAX), and more.
4. Libraries and Frameworks:
JavaScript has a rich ecosystem of libraries and frameworks such as jQuery, React, Angular, and Vue.js, which facilitate development and enhance productivity.
5. Server-Side Development:
With the introduction of Node.js, JavaScript can also be used for server-side development, enabling full-stack JavaScript development.
Setting Up JavaScript Environment
To start programming in JavaScript, you'll need a web browser and a text editor. Modern web browsers like Google Chrome, Mozilla Firefox, or Microsoft Edge come with built-in JavaScript engines that can execute JavaScript code.
Writing Your First JavaScript Program
Let's write a simple "Hello, World!" program in JavaScript to get started:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Hello, World!</title>
</head>
<body>
<script>
document.write("Hello, World!");
</script>
</body>
</html>
```
Explanation
- The `<script>` tag is used to embed JavaScript code within an HTML document.
- `document.write("Hello, World!");` writes "Hello, World!" to the document.
Running JavaScript Programs
You can run JavaScript programs directly within a web browser by opening an HTML file containing JavaScript code.
Example: Running Hello World Program
Save the above code in an HTML file (e.g., `hello.html`) and open it in a web browser.
Exercise
Practice writing and running JavaScript code. Experiment with different code snippets and explore JavaScript's syntax, features, and capabilities.
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